<?php

namespace org;

class UUID
{
    public static function v3($namespace, $name)
    {
        if (!self::is_valid($namespace)) return false;
        $nhex = str_replace(array('-', '{', '}'), '', $namespace);
        $nstr = '';
        for ($i = 0; $i < strlen($nhex); $i += 2) {
            $nstr .= chr(hexdec($nhex[$i] . $nhex[$i + 1]));
        }
        $hash = md5($nstr . $name);
        return sprintf('%08s-%04s-%04x-%04x-%12s',
            substr($hash, 0, 8),
            substr($hash, 8, 4),
            (hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x3000,
            (hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
            substr($hash, 20, 12)
        );
    }

    public static function v4($has = true)
    {
        $format ='%04x%04x-%04x-%04x-%04x-%04x%04x%04x';
        if($has === false){
            $format = '%04x%04x%04x%04x%04x%04x%04x%04x';
        }
        return sprintf($format,
            mt_rand(0, 0xffff), mt_rand(0, 0xffff),
            mt_rand(0, 0xffff),
            mt_rand(0, 0x0fff) | 0x4000,
            mt_rand(0, 0x3fff) | 0x8000,
            mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
        );
    }


    public static function v5($namespace, $name)
    {
        if (!self::is_valid($namespace)) return false;
        $nhex = str_replace(array('-', '{', '}'), '', $namespace);
        $nstr = '';
        for ($i = 0; $i < strlen($nhex); $i += 2) {
            $nstr .= chr(hexdec($nhex[$i] . $nhex[$i + 1]));
        }
        $hash = sha1($nstr . $name);
        return sprintf('%08s-%04s-%04x-%04x-%12s',
            substr($hash, 0, 8), substr($hash, 8, 4),
            (hexdec(substr($hash, 12, 4)) & 0x0fff) | 0x5000,
            (hexdec(substr($hash, 16, 4)) & 0x3fff) | 0x8000,
            substr($hash, 20, 12));
    }

    public static function is_valid($uuid)
    {
        return preg_match('/^\{?[0-9a-f]{8}\-?[0-9a-f]{4}\-?[0-9a-f]{4}\-?' .
                '[0-9a-f]{4}\-?[0-9a-f]{12}\}?$/i', $uuid) === 1;
    }
}